3 Level PWM - diyAudio
Go Back   Home > Forums > Amplifiers > Class D

Class D Switching Power Amplifiers and Power D/A conversion

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 29th October 2007, 04:37 PM   #1
dcmdcm is offline dcmdcm  Mexico
diyAudio Member
 
Join Date: Apr 2007
Default 3 Level PWM

Does anyone has tried a three level PWM amp?
I'm currently working on one,
Look at the pics atached
Does someone speak spanish?
Attached Files
File Type: zip class_d_amp_images.zip (98.5 KB, 372 views)
__________________
dcm
  Reply With Quote
Old 29th October 2007, 04:48 PM   #2
diyAudio Member
 
Join Date: May 2002
Location: Switzerland
I once made simulations with a tri-state delta-sigma topology that looked very promising. Never tried it in practice though. Yours seems to be a bit similar.

Properly implemented it would have advantages like lower switching frequency, lower RFI levels, improved loop stability, reduced supply pumping and decreased body-diode conduction problems - compared to two-level delta-sigma amps.

Regards

Charles
  Reply With Quote
Old 7th November 2007, 04:16 PM   #3
dcmdcm is offline dcmdcm  Mexico
diyAudio Member
 
Join Date: Apr 2007
Default sch

Here's a simple sch of the amp, is based on 2 carriers, they are fed into x5-1, and x5-3.
It's done this way because i'll run 3 ch with the same carriers to sync them.
Attached Images
File Type: jpg ampx.jpg (50.6 KB, 836 views)
__________________
dcm
  Reply With Quote
Old 8th November 2007, 04:17 AM   #4
diyAudio Member
 
Workhorse's Avatar
 
Join Date: Dec 2004
In trilevel PWM either you have 2 out of phase carrier wave to feed the comparators or you have 2 out of phase audio signal to fed.......

In your case it seems your audio signal is common and dual carriers are present but they need to be out of phase with each other.....
  Reply With Quote
Old 8th November 2007, 08:38 PM   #5
dcmdcm is offline dcmdcm  Mexico
diyAudio Member
 
Join Date: Apr 2007
exactly, i use 2 carriers, out of phase 180º, triangular shape, to lower the frec, but also they could be in phase with a dc offset so they don't overlap, like the AC inverters.
__________________
dcm
  Reply With Quote
Old 24th November 2007, 06:16 AM   #6
diyAudio Member
 
Workhorse's Avatar
 
Join Date: Dec 2004
Any updates on your project dcmdcm??
  Reply With Quote
Old 27th November 2007, 02:56 PM   #7
dcmdcm is offline dcmdcm  Mexico
diyAudio Member
 
Join Date: Apr 2007
i'm working in the pcbs, and i need to change the inductor because i'm using normal ferrite cores, but the magnetic fields interacts and cause a small distorsion in the high frecs. But here is quite dificult to find toroidal cores.

Any sugestion for the pcb layout
__________________
dcm
  Reply With Quote
Old 27th November 2007, 04:22 PM   #8
dcmdcm is offline dcmdcm  Mexico
diyAudio Member
 
Join Date: Apr 2007
a little pic of the working proyect
Attached Files
File Type: zip pics.zip (55.0 KB, 132 views)
__________________
dcm
  Reply With Quote
Old 27th November 2007, 04:30 PM   #9
Banned
 
Join Date: Jan 2005
T106-2 from micrometals is a good choice.
  Reply With Quote
Old 27th November 2007, 11:33 PM   #10
diyAudio Member
 
Join Date: Nov 2007
My estimado dcmdcm:
Cuando copies un esquematico en forma de un archivo de imagen, utiliza mejor el formato de imagen GIF o aun mejor el TIF, ya que el formato de imagen JPG distorsiona las lineas y caracteres y las hace dificiles de leer.
Aun mas, si en el formato TIF lo conviertes a 1 bit (monocramatico) y le aplicas compresion tipo CCITT grupo 4, consigues una imagen de alta resolucion, con un tamaño muy compacto.
Todas estas opciones estan disponibles en tu editor de imagenes.

English Translation
Dear dcmdcm:
Whenever you copy a schematic as an image file, it is best to employ the GIF or better the TIF image format, as the JPG format distorts lines and characters, and makes them difficult to read.
Even more, if the TIF format is converted to 1 bit (monochromatic), and you apply CCITT group 4 compression, you get a high resolution image of very compact size.
These options are available from your image editor.
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Convert Line Level to Electric Guitar Level miallen Solid State 4 16th May 2010 01:22 PM
Speaker level to line level converters qguy Subwoofers 2 9th December 2007 03:58 PM
speaker level input vs line level question crippledchicken Subwoofers 4 17th July 2007 03:36 AM
lesser of two evils, high level -> line level, digital volume control mazurek Solid State 3 19th November 2006 12:25 AM
how to bring down line level signal to preamplifier level deji Solid State 15 15th April 2004 04:13 PM


New To Site? Need Help?

All times are GMT. The time now is 03:40 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright ©1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2